This is a note to let you know that I've just added the patch titled
fuse: ignore entry-timeout on LOOKUP_REVAL
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fuse-ignore-entry-timeout-on-lookup_reval.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 154210ccb3a871e631bf39fdeb7a8731d98af87b Mon Sep 17 00:00:00 2001
From: Anand Avati <avati@xxxxxxxxxx>
Date: Thu, 26 Jun 2014 20:21:57 -0400
Subject: fuse: ignore entry-timeout on LOOKUP_REVAL
From: Anand Avati <avati@xxxxxxxxxx>
commit 154210ccb3a871e631bf39fdeb7a8731d98af87b upstream.
The following test case demonstrates the bug:
sh# mount -t glusterfs localhost:meta-test /mnt/one
sh# mount -t glusterfs localhost:meta-test /mnt/two
sh# echo stuff > /mnt/one/file; rm -f /mnt/two/file; echo stuff > /mnt/one/file
bash: /mnt/one/file: Stale file handle
sh# echo stuff > /mnt/one/file; rm -f /mnt/two/file; sleep 1; echo stuff > /mnt/one/file
On the second open() on /mnt/one, FUSE would have used the old
nodeid (file handle) trying to re-open it. Gluster is returning
-ESTALE. The ESTALE propagates back to namei.c:filename_lookup()
where lookup is re-attempted with LOOKUP_REVAL. The right
behavior now, would be for FUSE to ignore the entry-timeout and
and do the up-call revalidation. Instead FUSE is ignoring
LOOKUP_REVAL, succeeding the revalidation (because entry-timeout
has not passed), and open() is again retried on the old file
handle and finally the ESTALE is going back to the application.
Fix: if revalidation is happening with LOOKUP_REVAL, then ignore
entry-timeout and always do the up-call.
Signed-off-by: Anand Avati <avati@xxxxxxxxxx>
Reviewed-by: Niels de Vos <ndevos@xxxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/fuse/dir.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -198,7 +198,8 @@ static int fuse_dentry_revalidate(struct
inode = ACCESS_ONCE(entry->d_inode);
if (inode && is_bad_inode(inode))
goto invalid;
- else if (time_before64(fuse_dentry_time(entry), get_jiffies_64())) {
+ else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
+ (flags & LOOKUP_REVAL)) {
int err;
struct fuse_entry_out outarg;
struct fuse_req *req;
Patches currently in stable-queue which might be from avati@xxxxxxxxxx are
queue-3.15/fuse-ignore-entry-timeout-on-lookup_reval.patch
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